NTP Download



Basic information on NTP can be found on our NTP info page as well as in our knowledge base articles.

The Meinberg NTP package provides a GUI setup program for Windows which installs the NTP service and associated executable programs that have been compiled from the original public NTP source code available at the NTP download page at ntp.org.

The GUI installer also contains the corresponding HTML based NTP documentation, as well as the libcrypto DLL from the OpenSSL project, which is required to create or check signatures of the NTP network packets, if the symmetric or public key authentication feature is used.

Unattended installation is also supported. Please see the NTP Installer README for help on how to use the installer.

Actually there a different stable NTP versions provided, plus some additional information:

For the Windows operating system there's also an NTP Time Server Monitor program available which allows configuration of the local NTP service and graphical monitoring of the local and remote NTP servers.

If you have any questions or feedback, please contact ntp-support@meinberg.de.



NTP for current Windows versions (Windows XP and later), with IPv6 support

The current stable NTP version can be used with current 32 and 64 bit Windows versions (Windows XP and newer). Beside the standard IPv4 network protocol it also supports IPv6. Alternatively, there's an older version available which can also be used on Windows 2000 or even Windows NT.

Note: The current setup program ntp-4.2.8p15a supersedes ntp-4.2.8p15 and ntp-4.2.8p15-v2. It includes preliminary patches for some minor vulnerabilities, see this KB page.

This package also includes the current openSSL libcrypto DLL v1.1.1t.

It is explicitly recommended to upgrade earlier installations to this version.


Free Download NTP Software ntp-4.2.8p15a-win32-setup.exe (4.25 MB)
19. April 2023
NTP package with IPv6 support for Windows XP and newer

SHA256 Checksum:
ntp-4.2.8p15a-win32-setup.exe.sha256sum

How to verify integrity of the downloaded file


Note: If the NTP service fails to start after installation on Windows XP or Windows 7, the Visual Studio Redistributable package my be missing, althogh it should be available by default on all current Windows installations. The 32 bit (x86) version of the redistributable is required even on 64 bit Windows systems. The package is available from the Microsoft download page:

Go to Windows Download Center
Installation of the Redistributable Package (Screenshots)




NTP for Windows NT, Windows 2000, and newer, IPv4 only, without current security patches

This version of the NTP package is outdated but is still provided since it can also be used on Windows 2000 or even Windows NT. It supports IPv4 only, but not IPv6. For current Windows installations the current stable NTP version should be used which also contains current security patches.

Free Download NTP Software ntp-4.2.4p8@lennon-o-lpv-win32-setup.exe (2.8 MB)
26 October 2010
Old and stable NTP-package Windows NT/2000 (IPv4 only)
How to verify integrity of the downloaded file


Screenshots NTP Installer (Windows)

Here are some screenshot of the NTP installation (click to enlarge):

Step 1:
Step 1: Select the local program folder.

Schritt 2:
Step 2: Select the components to be installed.

Step 3a (without initial configuration file):
for experienced users - the configuration file must be setup manually.

Step 3b: (initial configuration with external time server):
specification of up to 9 external NTP servers.

Step 3c (initial configuration with Meinberg Time Service):
Set up your own NTP server with built-in Meinberg reference clock (e.g. GPS180PEX).

Step 4:
Select the service settings (recommended "Use System Account").

A detailed description of the NTP installation can be found at:
README NTP-Installer


External Web Links:

  • David Taylor created a detailed step-by-step walkthrough of the installation on his website.
  • The official documentation of the NTP Reference Implementation is included in the setup program and will (optionally) be installed together with the binaries. It is also available of the NTP documentation website. Please make sure you select the NTP version that is included in the installer.


NTP Cheat Sheet


NTP Cheat Sheet NTP Cheat Sheet v1.0   (308 kB)

NTP Short Reference (A4, 2 pages), English language. Contains short lists of the most important NTP configuration parameters, command line options and file formats used by NTP, e.g. for the keyfile or the statistic files that can be generated by ntpd (loopstats, peerstats, clockstats, sysstats).


Linux driver for Meinberg plug-in radio clocks


A Linux driver for Meinberg PC plug-in cards is available on our driver download page. That driver is only required for plug-in radio clocks. Radio clocks which are connected via a serial interface are directly supported by NTP.

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